IETM Classes

The functionality of IETMs systems is broken down into five classes.
Class I - This IETM class follows the structure and format of a printed book, with indexes and table of contents that are hyperlinked into the content of the document. This might be a scanned book with some links added.
Class II - This format includes more hyperlinks than Class I, such as figures, tables and section references. A hyperlinked PDF document is the typical example. The document would be authored in XML/SGML.
Class III - The difference between Class II and Class III is analogous to the difference between PDF book and a web site. The book structure is discarded; instead the document is structured more freely following the logic of the content. The document can still be printed but it won't necessarily match the presentation on the screen. Hyperlinking throughout the document is expected. The document would be authored in a markup language, typically SGML.
Class IV - This class now expects the data to be stored in a relational database, obtaining benefits of data integrity and removal of data redundancy. Relationships in the content that are presented as hyperlinks, are mapped directly to relations in the database schema. Redundancy in the data that exists in earlier classes should be removed. The sequence of presentation is also different that earlier classes. There is no longer the concept of a static page. Content can change dynamically based on users navigation and input through the content; the content may now be user specific. It is no longer possible to print a linear format of the document.
Class V - In this class the documentation is now integrated with expert systems that may influence the display of content. For example, the IETM system may aggregate data from a large number of users input, feed that to the expert system that analyzes it and then the result gets fed back to the user through the IETM system. An analogy might be Google search, where search results are improved based on analysis of large data sets of previous queries entered by users.